Cayde's Farewell: You're My Favourite | Sacrifices Himself To Rez Ghost | Destiny 2: The Final Shape 

The strain of blasting the Witness with Light causes our battered Ghost to finally fall. Our Guardian begs the Traveler to restore him - but it is Cayde who answers our call.
Cayde makes his own fate and decides to use his Light to resurrect our Ghost. In his final moments, he reminds The Guardian: You're my favourite. Don't ever forget that.